EIR is used in eQUEST,all the EER/SEER/HSPF will be converted to EIR finally.

where
CAP Total Cooling Capacity(Btu/h)
EER ARI Rated Energy Efficenice Ratio

Cooling EIR=(1/EER-0.012167)/((1/3.413)+0.012167)
Where
EIR=(1/EER-0.012167)/((1/3.413)+0.012167) Where the constant 0.012167=(365/1000)(400/12000)
(400/12000) EER=SEER0.778+1.4

Heating EIR = (1/(COP3.413)-0.012167)/((1/3.413)-0.012167)
3.413)-0.012167)/((1/3.413)-0.012167) Heating EIR = (1/((HSPF0.28+1.13)*3.413)-0.012167)/((1/3.413)-0.012167)